CDC 2A652 Vol. 4

When filling and bleeding the MJ-2A-1 hydraulic test stand, it is important to pressurize and bleed the system until a solid line of fluid can be seen in the sight tube. This indicates that there are no air bubbles present in the system and that the hydraulic fluid is properly filled and bled. This ensures that the hydraulic system will function correctly and efficiently. The other options, such as the sight tube being filled with bubbles, the sight tube fluid turning milky, or the sight tube fluid being blue in color, are incorrect as they indicate potential issues or incorrect filling and bleeding procedures.

During an operational check of the MJ-1B bomblift, it is important for all hydraulic components to exhibit a smooth movement with no binding or jumping. This means that the components should move seamlessly and without any jerking or sticking. This ensures that the bomblift is functioning properly and can safely lift and transport bombs. Fast steady movements with minimal jumping may indicate a problem with the hydraulic system. Settling once the actuator is released is not ideal as it may affect the stability of the bomblift. Small amounts of residue are also not desirable as they may indicate leaks or other issues with the hydraulic components.

A mesh screen is used to prevent large particles in the fluid from entering the reservoir when servicing the hydraulic cart. The mesh screen acts as a filter, allowing only smaller particles and clean fluid to pass through while blocking larger particles. This helps to maintain the cleanliness and integrity of the hydraulic system, preventing any potential damage or contamination caused by large particles in the fluid.

Repairing ground heater equipment can be a complex task that requires accurate technical information. Without this data, attempting repairs can be dangerous and may result in further damage or injury. Therefore, it is crucial to have access to accurate technical data before attempting any repairs on ground heater equipment.

The B-4 adjustable aircraft maintenance platform utilizes a scissor mechanism to raise and lower the platform. This mechanism consists of crossed bars connected by a pivot joint, allowing the platform to be raised and lowered in a controlled manner. The scissor mechanism is commonly used in various lifting and lowering applications due to its simplicity and effectiveness.

The ammeter is the component that will give a visual indication that the alternator is charging. An ammeter is used to measure the flow of electric current in a circuit, and in this case, it will show the current being produced by the alternator. If the ammeter shows a positive reading, it means that the alternator is charging the electrical system. Therefore, the ammeter is the correct component to look at when troubleshooting the electrical system on the MJ-1B bomblift.

The hand-operated cable is used to raise the mast on the FL-1D. This suggests that there is a mechanism involving a cable that can be manually operated to lift the mast. The other options, screw mechanism, pneumatic controls, and hydraulic cylinder, are not mentioned in relation to raising the mast, making them less likely to be the correct answer.

The head adapter assembly of the towbar has a screw actuated fork assembly that is used to engage or disengage the aircraft nose gear. This means that the head adapter assembly is responsible for securely connecting the towbar to the aircraft's nose gear, allowing for easy movement and towing of the aircraft.

The counterbalance valve on the MJ-1B bomblift prevents collapsing of the cantilever lifting arms in the event of hydraulic pressure failure. This valve is designed to maintain the balance of the arms by controlling the flow of hydraulic fluid. It ensures that even if there is a loss of hydraulic pressure, the arms will remain stable and prevent any collapsing or accidents.

Prior to raising or lowering the mast from the vertical or horizontal position on the FL-1D, the towbar must be positioned to the left or right. This is important because the towbar is used to support and stabilize the mast during the raising or lowering process. By positioning it to the left or right, it ensures that the mast is properly supported and prevents any damage or accidents during the operation.

The correct answer is "Unit manufacturer’s TO." This refers to the unit manufacturer's Technical Order, which is a document that provides detailed instructions and procedures for testing and maintaining a particular component. It is a reliable source of information as it is created by the manufacturer themselves and contains specific instructions tailored to their product. The other options, such as periodic inspection workcards, service inspection workcards, and illustrated parts breakdown, may provide some information but may not be as comprehensive or specific as the manufacturer's TO.

The correct answer is British thermal unit. This is because the British thermal unit (BTU) is a unit of measurement commonly used in the United States to quantify the amount of heat energy required to raise the temperature of one pound of a substance by one degree Fahrenheit. It is widely used in the field of heating, ventilation, and air conditioning (HVAC) to measure the heating or cooling capacity of systems.

The SGNSC nitrogen booster compressor should stop at a storage cylinder pressure of 4400 psig.

To verify if a malfunction exists when a unit comes in with a write-up, the best approach is to operate the unit. By operating the unit, one can observe its behavior and determine if there are any issues or malfunctions. This step allows for firsthand experience and assessment of the unit's performance, enabling a more accurate diagnosis of the problem. Analyzing the problem, performing a service inspection, and giving probable causes can be done after operating the unit to further investigate and pinpoint the specific malfunction.

The separation membrane is the component on the SGNSC that removes nitrogen from the ambient air. It is responsible for separating the nitrogen gas from the other gases present in the air, allowing for the production of nitrogen gas with high purity. This is achieved through a process called membrane separation, where the membrane selectively allows certain gases to pass through while blocking others. In this case, the separation membrane allows nitrogen to pass through while removing other gases, resulting in the removal of nitrogen from the ambient air.

To check the backup hydraulic system on the MHU-83C/E bomblift, you need to operate the hand pump. This is because the hand pump is responsible for manually pressurizing the hydraulic system in case of a failure or emergency. By operating the hand pump, you can ensure that the backup hydraulic system is functioning properly and ready for use if needed.

The throttle assembly is the component that provides manual speed adjustment on the AF/M32T-1 cabin leakage tester. The tachometer is used to measure the speed of the engine, the diesel engine is not relevant to manual speed adjustment, and the fuel system relief valve is not related to speed adjustment. Therefore, the correct answer is the throttle assembly.

When the pressure within a refrigeration system is less than atmospheric pressure, it creates a vacuum. Inward leaks refer to the type of refrigeration system leak that occurs in this situation, where air or other substances are drawn into the system due to the pressure difference. This can lead to a decrease in system efficiency and potential damage if not addressed.

The correct answer is 30 psi oil pressure is registered on the engine oil pressure gauge. This is because the instruction states to hold the safety override switch until this specific pressure is reached. This indicates that the engine has sufficient oil pressure to start and operate properly. Once this pressure is registered, it is safe to release the start switch and proceed with starting the engine.

Oil-moisture traps are required on a multi-stage reciprocating compressor to remove moisture from the compressed air. As the air is compressed, the temperature and pressure increase, causing the moisture in the air to condense. This condensed moisture can be detrimental to the compressor and the downstream equipment, leading to corrosion and damage. Therefore, oil-moisture traps are installed to capture and separate the moisture from the compressed air, ensuring that only dry air continues downstream. This helps to protect the compressor and maintain the quality of the compressed air for further use.

The purpose of the lift mechanism on the towbar is to raise and lower the wheel assemblies. This means that the lift mechanism is responsible for lifting or lowering the wheels of the aircraft when it is being towed. This is important for maneuvering the aircraft on the ground and ensuring that it is in the correct position for towing. The lift mechanism allows for easy adjustment of the height of the wheels, making it easier to connect and disconnect the towbar from the aircraft.

If there is a discrepancy between the workcards and TO, the correct course of action is to refer to the workcards. The workcards provide specific instructions and guidelines for carrying out tasks, and they are typically created based on the information provided in the TO (Technical Order). However, in case of any discrepancies or inconsistencies, it is important to rely on the information provided in the workcards as they are more likely to reflect the most up-to-date and accurate instructions for completing the task at hand.

The MC-2A rotary vane compressor is cooled using oil. Oil is commonly used as a cooling medium in compressors because it has good heat transfer properties and can effectively dissipate the heat generated during compression. It also helps lubricate the moving parts of the compressor, reducing friction and wear. Using air or water as a cooling medium may not be as effective in cooling the compressor and may not provide the necessary lubrication. Hydraulic fluid is not typically used for cooling compressors.

The MA-3D aftercooler system uses an ethylene glycol/water solution to carry heat away from the conditioned air stream. This solution is commonly used as a coolant in various cooling systems due to its high heat transfer capabilities. It absorbs heat from the air stream and carries it away, preventing the air from becoming overheated. The ethylene glycol/water solution is an effective and efficient solution for maintaining the desired temperature in the aftercooler system.

The stair support linkage is the component on the B-1 adjustable aircraft maintenance platform that allows the work platform and steps to remain parallel to the base at any desired platform height. This linkage mechanism ensures that the platform remains stable and level, providing a safe and secure working environment for maintenance personnel.

The oil in the rotary vane compressor forms a seal between the vanes and the stator. This is important because it helps to prevent any leakage of air or gas during the compression process. The oil creates a barrier between the moving parts, ensuring that they remain in contact and allowing for efficient compression. Without this seal, there would be a loss of pressure and the compressor would not be able to function effectively.

The air compressor in the SGNSC is categorized as high-pressure because it is designed to generate and deliver compressed air at a high pressure level. This means that the air compressor is capable of producing air at a greater force, which is useful for applications that require high-pressure air, such as powering pneumatic tools or filling high-pressure air tanks.

Superheat refers to the addition of heat to a gaseous substance beyond its boiling point, resulting in an increase in temperature without a phase change. Sensible heat refers to the heat added or removed that causes a change in temperature, specific heat is the amount of heat required to raise the temperature of a substance, and latent heat is the heat absorbed or released during a phase change. Therefore, the correct answer is superheat as it specifically relates to the addition of heat to a gaseous substance.

The emergency switch, when turned to the OFF position, will prevent all control console functions except platform lowering and engine operation. This switch is specifically designed to disable all other functions in emergency situations, allowing for the safe lowering of the platform and continued engine operation if needed.

The probable cause of the malfunction is that the warming door is not lowered for cold weather operating conditions. This could lead to insufficient warming of the engine, causing the nitrogen purity to not reach the required level within the specified time frame.

The oil pressure switch is responsible for monitoring the oil pressure in the engine system. In the event of a malfunction, such as low oil pressure, the oil pressure switch will activate the warning horn to alert the operator. This safety device ensures that any issues with the engine system are promptly detected and addressed, preventing potential damage or accidents. The other options, water level switch, fuel level indicator, and fuel pressure switch, do not directly relate to monitoring the engine system and therefore are not the correct answer.

The davit (lift pulley) on the maintenance platform has two lifting capacities: 250 lbs or 500 lbs.

If the air intake of the AF/M32T-1 cabin leakage tester was restricted, it would have a negative effect on operation by causing low blower output. This means that the tester would not be able to generate sufficient air pressure to effectively test the cabin for leaks. Without adequate airflow, the tester would not be able to accurately detect any leaks in the cabin, compromising its functionality.

When performing maintenance on the SGNSC, it is important to keep safety in mind. This means taking necessary precautions to ensure the well-being of individuals involved in the maintenance process. Safety measures may include wearing appropriate protective gear, following proper procedures, and being aware of potential hazards. Prioritizing safety helps to prevent accidents, injuries, and damage to equipment, ensuring a successful and efficient maintenance operation.

When verifying the proper operation of the centering mechanism on the MHU-83C/E bomblift, the unit should not move in neutral. This means that when the unit is in neutral, it should remain stationary and not move.

To bypass the long scissors control cable and operate the control console while observing the test meter, you can plug the control console directly into the hydraulic control module. This allows you to bypass the control cable and directly interface with the hydraulic control module, enabling you to operate the control console and monitor the test meter for troubleshooting purposes.

When the engine of the MJ-1B starts, it is important to check for sufficient oil pressure. This is because oil pressure is crucial for lubricating the engine's moving parts and ensuring smooth operation. Without sufficient oil pressure, the engine could suffer from excessive wear and tear, leading to potential damage or failure. Checking for oil pressure is therefore a necessary step to ensure the engine's health and performance.

When performing refrigerant recovery, it is important to use vacuum pumps. Vacuum pumps are used to remove air and moisture from the refrigeration system, ensuring that the system is properly evacuated and ready for recharging with new refrigerant. This helps to prevent any contaminants from entering the system and causing damage to the compressor or other components. Using vacuum pumps also helps to achieve the desired level of vacuum in the system, which is necessary for proper operation and efficiency.

When LOX carts are being transported, the vent valve should be in the closed position. This is because the vent valve is responsible for releasing excess pressure from the cart. During transportation, it is important to keep the vent valve closed to prevent any leakage or loss of LOX, which is highly volatile and can be dangerous.

The correct answer is 10 seconds. This is the maximum amount of time that the ignition switch should be placed in the start position to start the SGNSC. Placing the switch in the start position for more than 10 seconds may cause damage or malfunction to the system.

The relief valve prevents overpressurization of the steering system in the MJ-1B bomblift. It is designed to open and release excess pressure when it reaches a certain threshold, ensuring that the system does not become overpressurized. This helps to maintain the proper functioning and safety of the steering system.

The purpose of the low pressure pump on the MJ-2A-1 is to ensure a constant flow of fluid to the high pressure pump. The high pressure pump requires a consistent supply of fluid in order to function properly and generate the necessary pressure. The low pressure pump acts as a feeder, ensuring that the high pressure pump always has a sufficient amount of fluid available.

If the position of the reservoir selector valve is changed during operation, it can potentially cause a sudden change in the flow of hydraulic fluid. This sudden change in flow can put excessive pressure on the flowmeter, causing it to be damaged.

A restriction in a refrigerant system can be identified by observing frosting at the outlet. When there is a restriction in the system, the flow of refrigerant is hindered, causing a decrease in pressure and temperature. This leads to the formation of frost on the outlet as the refrigerant cools down rapidly. Therefore, the presence of frosting at the outlet indicates a restriction in the refrigerant system.

To precharge the supply tank of the PMU-29/E oil cart, the valve handle should be in the BYPASS position. This means that the valve is diverting the flow of oil away from the supply tank and allowing it to circulate back into the system without entering the tank. This allows the tank to be pressurized and filled with oil before it is put into use.

The engine safety circuits on the FL-1D shutdown the engine by shutting off fuel to the engine. This means that the flow of fuel to the engine is stopped, causing the engine to stop running. This is a common safety measure in engines to prevent any potential accidents or damage that could occur if the engine were to continue running without control. By shutting off the fuel supply, the engine is effectively disabled and brought to a stop.

The pilot check valve prevents accidental loss of cylinder extension on the outriggers of the split deck maintenance platform. This valve allows fluid to flow in one direction only, ensuring that the cylinder remains extended and does not retract unintentionally. It acts as a safety measure to maintain stability and prevent any potential accidents or damage caused by the sudden loss of cylinder extension.

The speed of retraction of the hydraulic cylinder assembly on the B-1 adjustable aircraft maintenance platform is controlled by the handle on the bypass valve. This valve allows for the regulation of hydraulic fluid flow, which in turn determines the speed at which the cylinder assembly retracts. By adjusting the handle on the bypass valve, the operator can control the speed of retraction to ensure safe and efficient operation of the maintenance platform.

The probable cause for the platform not lowering while operating the split deck maintenance platform could be a defective control cable. This could mean that there is a malfunction or damage in the control cable, preventing it from properly functioning and lowering the platform.

An amplifier is used to increase the strength of the signals in the universal jack tester control box. This helps to keep the background noise to a minimum by boosting the signal and making it more distinguishable from the noise. An analog digital converter is responsible for converting analog signals to digital signals, a microprocessor is used for processing and controlling the signals, and a filter is used to remove unwanted frequencies from the signals. However, in this case, the amplifier is the component specifically used to increase signal strength and reduce background noise.